Support ssl_cert_file/ssl_key_file (#123)

* Support ssl_cert_file/ssl_key_file

close #122
close #84

* Update README

Fix non-redirect failure (#113)

* Fix non-redirect failure

* update

* Fix tests

* Add test

update composer.json (#101)

Fix: Call to undefined method Swlib\Saber\Request::removeInterceptor() (

#91)

Update dependencies

Revert #38 (keep-alive feature)

Merge branch 'master' into v1.x

Update composer.json

Update composer.json

use stream_for instead of BufferStream